from washington, d.c. to miami to california, bells rang fare each life lost at sandy hook elementary school. at the episcopal church in newtown, connecticut, the bell tolled 28 times. one time for each life lost, including the shooter's. as the people of newtown cope with how this tragedy took place, investigators continue to search for the why. what motivated 20-year-old adam lanza to go on a mass killing spree? cnn's susan candiotti joins me now with the very latest. nice to see you and have you with us this morning. is there any better sense on the part of investigators about what was adam lanza thinking? what was going through his mind? >> that's what we would all of course like to know. of course, investigators have been working very hard on all of this nonstop. so far, there is very little indication that he had much of an online presence, for example, did he flag his intentions to anyone online? did he play any online games with anyone? did he tell anyone what he was thinking about? these are the t